EEMB 2 Lecture Notes - Lecture 6: Logistic Function, Commensalism, Ecological Niche
15 Mar 2018
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Mutualism (+,+): both species benefit from the association. Commensalism (+, 0): one species benefits form the association, the other is unaffected. Remora-gains food access from the leftovers of the shark while the shark wastes energy but is still considered as unaffected because it doesn"t affect reproductive rates for sharks-negative effect measures at population levels. Amensalism (-,0): one species is harmed by the association, the other is unaffected. Competition (-,-): both species are harmed from the association. Lion and hyena fighting because both animals sustain injuries. Occurs over resources such as food, space, light, nutrients. Lotka-volterra equation that is based on the logistic growth. Need a conversion factor: to convert the number of species. 2 individuals into an equivalent number of species 1 individuals in terms of their competitive effects and vice versa. Alpha n2-expressing species 2 in units of species 1. Beta n1-expressing species 1 in units of species 2.
